Well, Alison always saw her own point of view so clearly that she didn't always see how things might appear to, or affect, other people. (Chapter 2)

"I don't—didn't dislike her. But she's just not my type. Too interfering."
"You mean inquisitive, nosy?"
"No I don't," said Cherry. "I don't mean that at all. She was a very kind woman and she was always doing things for people. And she was always quite sure she knew the best thing to do. What they thought about it wouldn't have mattered." (Chapter 6.i)

"Why? Did she bully him?"
"Oh, no," said Miss Marple, "but I don't think that she—well, she wasn't a considerate woman. Kind, yes. Considerate, no. She would be fond of him, and look after him when he was ill and see to his meals and be a good housekeeper, but I don't think she would ever—well, that she would ever even know what he might be feeling or thinking. That makes rather a lonely life for a man." (Chapter 8.ii)

"Well, frankly," said Mrs. Bantry, "I can't imagine anybody wanting to kill Heather Badcock. I've seen her quite a few times, on local things, you know. Girl Guides and the St. John Ambulance, and various parish things. I found her a rather trying sort of woman. Very enthusiastic about everything and a bit given to over-statement, and just a bit of a gusher. But you don't want to murder people for that. She was the kind of woman who in the old days if you'd seen her approaching the front door, you'd have hurried out to say to your parlourmaid—which was an institution we had in those days, and very useful too—and told her to say 'not at home' or 'not at home to visitors,' if she had conscientious scruples about the truth."

"You mean one might have taken pains to avoid Mrs. Badcock, but one would have no urge to remove her permanently." (Chapter 8.iii)

"Heather Badcock meant no harm. She never did mean harm, but there is no doubt that people like Heather Badcock (and my old friend Alison Wilde) are capable of doing a lot of harm because they lack—not kindness, they have kindness—but any real consideration for the way their actions may affect other people. She always thought of what an action meant to her, never sparing a thought for what it might mean to somebody else." (Chapter 23.i)